Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4c5695ffe35338…

MALICIOUS

PDF

71.1 KB Created: 2021-09-19 18:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5991f05e85b315c8db089fd751322327 SHA-1: e5dbf2ee8970796bc9aed0c7e8216e5be14b84e7 SHA-256: 1e4c5695ffe35338b5d1714b784be6931dca3d931d700aa137af6e33fe034a1d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=viewpager+indicator+android PDF link annotation
    • http://av-jet.ru/userfiles/file/xiwubivoniw.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/poxalofuboguruwajativad.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/fidokuziw.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/6647815455.pdfIn PDF document text
    • http://soles2walk.cz/data/file/90427058441.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/36113911065.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/lofijem.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/xotirakorusaparulazokevuz.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lerarabexovabujokanowe.pdfIn PDF document text
    • http://18554080.com/userfiles/file/73411891495.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/xexubajodazatizab.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/xogufijoturevarijikas.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/85666448345.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/duvowovaromigamelonopemat.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/78195981051.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/47112690500.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/66447496749.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/26751082181.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161353a646213d---1816669492.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161311e53b67b7---18820545402.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/dumekituxidi.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/61976121330.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/jokekolidipajojega.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 10528 bytes
SHA-256: 78f562681631e85c8640fd9a250076e783352e90ea3c07d595c00e505428dbe5
font_02_sfnt_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 15792 bytes
SHA-256: d1be9a0470c4db59b0430ed01b950266767f2c645b40b2725a579ab0759da522

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